Fruit flies are by far the best food for them. You can get wingless flies in any reptile shop. Simply add to the surface of the water a few at a time. Otherwise small houseflies, mosquito larvae, tiny crickets, etc work well. With a bit of luck, frozen bloodworms can be hand fed using forceps. Dried foods take a while to be accepted, so don't use them until the fish learns that you're the food source!
Do remember that Pantodon has a very specific mode of feeding and will only attack prey within quite a small arc around each eye.
Cheers, Neale